Stair construction



June 5, 1923. 1,457,515

P. FRISCH STAIR CONSTRUQTION Filed June 25 1921 /l L I I Even/rv Patented June 5,' 1923.

UNITED STATES PAUL FRISCH', OF CHICAGO,` ILLINOIS.

STAIR CONSTRUCTION.

Application led .Tune 25, 1921.

To all 'w71 om t may concern Be it known that I, PAUL F nisoH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Stair Constructions, of which the following is a specification.

Stairs have heretofore been constructed of steel or iron with concrete or asphalt treads. In the usual construction a moulding is provided at the upper edge of the riser for holding the layer of concrete or asphalt in position and protecting the edge of the same. These treads have also been provided with plates commonly known as safety treads these safety treads are usually formed of iron with longitudinal grooves filled with lead or other suitable substances. Such treads were commonly placed behind the edge of the moulding and held in position by means of bolts inserted in the concrete. This construction is un- 'satisfactory as the treads tend to work loose and can not be readily fastened or secured to the concrete. In accordance with this invention, I provide an improved stair construction whereby stairs or steps may be provided with safety treads, which will be securely held in position and which may be readily renewed or replaced.

The objects of this invention are to provide an improved construction for stairs or steps; to provide means for attaching safety treads to stairs or the like; and, in general to provide such improvements and advantages as will be described more fully hereinafter.

In the accompanying drawings illustrating this invention;

Figure 1 is a plan view;

Figure 2 is' a sectional view; and,

Figure 3 is an enlarged sectional detail.

As shown in these drawings, the main portions of the stairs comprise tread plates 4 with a layer of concrete or asphalt 5 thereon. The riser 6 has an integrally formed moulding 7, the upper portion 8 being continued back for some distance substantlally parallel to the plate 4;. This wide or extended flange on the moulding serves as a support for the safety tread 9, which is secured thereto by means of bolts 10 or other suitable fastening devices. In this instance, the nuts 11 which are below the Serial N o. 480,307.

ange 8 will be held by the asphalt or con- 55 crete 9, so that if the tread should become worn, the screws or bolts 10 may be removed and a new tread inserted in place of the worn one. It will also be noted that the nuts may be soldered or otherwise fas- 00 v tened to the plate 8 and this plate may also be threaded to receive the bolts 10. The tread plates may extend the entire width of the steps, but are usually made somewhat shorter as shown in Figure l and the be made in various sizes and shapes for different conditions and changes may be made in the details of construction without departing from the scope of the present invention.

From this description and the illustrations, it will be seen that I provide a simple and effective arrangement for securing the safety treads in a substantial manner, and I have found from actual experience that these treads will be effectively tion thereby lessening the expense of keepingstairs or steps in proper condition.

aving thus described my invention, what I claim is:

1. In a stairs construction, tion of a moulding member for the front edge of the step, having a rearwardly eX- tending iiange of substantially the same Width as the safety tread, a safety tread secured to said flange and a filling of concrete or the like forming the main portion of the step and having its upper `surface substantially Hush with the safety tread.

2. A step comprising a substantially horiaontal plate, an upwardly extending moulding at the front edge of the plate, said moulding having a rearwardly extending flange parallel to the plate, a tread member engaging with said flange, bolts for securing the tread member filling of concrete on said plate extending to the upper surface of the tread member.

3. In a stairs, the combination of a tread plate, a riser plate engaging with said plate and projecting upwardly per edge of said riser being bent down horizontal with the tread plate, a safety tread mounted on said downwardly bent porheld in posi- 80 the combina- 85 to the ange and a therefrom, the uption, a layer of concrete on said tread plate the combination of a riser having a horiand extending under said downwardly bent zontal flange at the upper edge thereof, a portion, and bolts for securing the safety tread member superimposed on said ange 10 tread, the nuts of seid bolts being embedded and bolts for securing 'the treed member to 5 n the concrete below the downwardly bent the flange.

portion.

4. In a device of the character set forth, n PAUL FRISCH. 

